Blame view
net/llc/llc_sap.c
11.4 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 |
/* * llc_sap.c - driver routines for SAP component. * * Copyright (c) 1997 by Procom Technology, Inc. * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br> * * This program can be redistributed or modified under the terms of the * GNU General Public License as published by the Free Software Foundation. * This program is distributed without any warranty or implied warranty * of merchantability or fitness for a particular purpose. * * See the GNU General Public License for more details. */ #include <net/llc.h> #include <net/llc_if.h> #include <net/llc_conn.h> #include <net/llc_pdu.h> #include <net/llc_sap.h> #include <net/llc_s_ac.h> #include <net/llc_s_ev.h> #include <net/llc_s_st.h> #include <net/sock.h> |
c752f0739 [TCP]: Move the t... |
24 |
#include <net/tcp_states.h> |
1da177e4c Linux-2.6.12-rc2 |
25 |
#include <linux/llc.h> |
5a0e3ad6a include cleanup: ... |
26 |
#include <linux/slab.h> |
1da177e4c Linux-2.6.12-rc2 |
27 |
|
f83f1768f [LLC]: skb alloca... |
28 29 30 31 32 33 |
static int llc_mac_header_len(unsigned short devtype) { switch (devtype) { case ARPHRD_ETHER: case ARPHRD_LOOPBACK: return sizeof(struct ethhdr); |
f0ecde146 net: Fix FDDI and... |
34 |
#if defined(CONFIG_TR) || defined(CONFIG_TR_MODULE) |
f83f1768f [LLC]: skb alloca... |
35 36 37 38 39 40 |
case ARPHRD_IEEE802_TR: return sizeof(struct trh_hdr); #endif } return 0; } |
1da177e4c Linux-2.6.12-rc2 |
41 42 |
/** * llc_alloc_frame - allocates sk_buff for frame |
1d67e6501 [LLC]: Make llc_f... |
43 |
* @dev: network device this skb will be sent over |
f83f1768f [LLC]: skb alloca... |
44 45 |
* @type: pdu type to allocate * @data_size: data size to allocate |
1da177e4c Linux-2.6.12-rc2 |
46 47 48 49 |
* * Allocates an sk_buff for frame and initializes sk_buff fields. * Returns allocated skb or %NULL when out of memory. */ |
f83f1768f [LLC]: skb alloca... |
50 51 |
struct sk_buff *llc_alloc_frame(struct sock *sk, struct net_device *dev, u8 type, u32 data_size) |
1da177e4c Linux-2.6.12-rc2 |
52 |
{ |
f83f1768f [LLC]: skb alloca... |
53 54 55 56 57 |
int hlen = type == LLC_PDU_TYPE_U ? 3 : 4; struct sk_buff *skb; hlen += llc_mac_header_len(dev->type); skb = alloc_skb(hlen + data_size, GFP_ATOMIC); |
1da177e4c Linux-2.6.12-rc2 |
58 59 |
if (skb) { |
0a1b0ad9a [LLC]: Use skb_re... |
60 |
skb_reset_mac_header(skb); |
f83f1768f [LLC]: skb alloca... |
61 |
skb_reserve(skb, hlen); |
c1d2bbe1c [SK_BUFF]: Introd... |
62 |
skb_reset_network_header(skb); |
badff6d01 [SK_BUFF]: Introd... |
63 |
skb_reset_transport_header(skb); |
1da177e4c Linux-2.6.12-rc2 |
64 |
skb->protocol = htons(ETH_P_802_2); |
1d67e6501 [LLC]: Make llc_f... |
65 |
skb->dev = dev; |
d389424e0 [LLC]: Fix the ac... |
66 67 |
if (sk != NULL) skb_set_owner_w(skb, sk); |
1da177e4c Linux-2.6.12-rc2 |
68 69 70 |
} return skb; } |
04e4223f4 [LLC]: Do better ... |
71 |
void llc_save_primitive(struct sock *sk, struct sk_buff* skb, u8 prim) |
1da177e4c Linux-2.6.12-rc2 |
72 |
{ |
8420e1b54 [LLC]: fix llc_ui... |
73 |
struct sockaddr_llc *addr; |
1da177e4c Linux-2.6.12-rc2 |
74 75 |
/* save primitive for use by the user. */ |
8420e1b54 [LLC]: fix llc_ui... |
76 |
addr = llc_ui_skb_cb(skb); |
30a584d94 [LLX]: SOCK_DGRAM... |
77 78 |
memset(addr, 0, sizeof(*addr)); |
04e4223f4 [LLC]: Do better ... |
79 |
addr->sllc_family = sk->sk_family; |
1da177e4c Linux-2.6.12-rc2 |
80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 |
addr->sllc_arphrd = skb->dev->type; addr->sllc_test = prim == LLC_TEST_PRIM; addr->sllc_xid = prim == LLC_XID_PRIM; addr->sllc_ua = prim == LLC_DATAUNIT_PRIM; llc_pdu_decode_sa(skb, addr->sllc_mac); llc_pdu_decode_ssap(skb, &addr->sllc_sap); } /** * llc_sap_rtn_pdu - Informs upper layer on rx of an UI, XID or TEST pdu. * @sap: pointer to SAP * @skb: received pdu */ void llc_sap_rtn_pdu(struct llc_sap *sap, struct sk_buff *skb) { struct llc_sap_state_ev *ev = llc_sap_ev(skb); struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); switch (LLC_U_PDU_RSP(pdu)) { case LLC_1_PDU_CMD_TEST: ev->prim = LLC_TEST_PRIM; break; case LLC_1_PDU_CMD_XID: ev->prim = LLC_XID_PRIM; break; case LLC_1_PDU_CMD_UI: ev->prim = LLC_DATAUNIT_PRIM; break; } ev->ind_cfm_flag = LLC_IND; } /** * llc_find_sap_trans - finds transition for event * @sap: pointer to SAP * @skb: happened event * * This function finds transition that matches with happened event. * Returns the pointer to found transition on success or %NULL for * failure. */ static struct llc_sap_state_trans *llc_find_sap_trans(struct llc_sap *sap, struct sk_buff* skb) { int i = 0; struct llc_sap_state_trans *rc = NULL; struct llc_sap_state_trans **next_trans; struct llc_sap_state *curr_state = &llc_sap_state_table[sap->state - 1]; /* * Search thru events for this state until list exhausted or until * its obvious the event is not valid for the current state */ for (next_trans = curr_state->transitions; next_trans[i]->ev; i++) if (!next_trans[i]->ev(sap, skb)) { rc = next_trans[i]; /* got event match; return it */ break; } return rc; } /** * llc_exec_sap_trans_actions - execute actions related to event * @sap: pointer to SAP * @trans: pointer to transition that it's actions must be performed * @skb: happened event. * * This function executes actions that is related to happened event. * Returns 0 for success and 1 for failure of at least one action. */ static int llc_exec_sap_trans_actions(struct llc_sap *sap, struct llc_sap_state_trans *trans, struct sk_buff *skb) { int rc = 0; llc_sap_action_t *next_action = trans->ev_actions; for (; next_action && *next_action; next_action++) if ((*next_action)(sap, skb)) rc = 1; return rc; } /** * llc_sap_next_state - finds transition, execs actions & change SAP state * @sap: pointer to SAP * @skb: happened event * * This function finds transition that matches with happened event, then * executes related actions and finally changes state of SAP. It returns * 0 on success and 1 for failure. */ static int llc_sap_next_state(struct llc_sap *sap, struct sk_buff *skb) { int rc = 1; struct llc_sap_state_trans *trans; if (sap->state > LLC_NR_SAP_STATES) goto out; trans = llc_find_sap_trans(sap, skb); if (!trans) goto out; /* * Got the state to which we next transition; perform the actions * associated with this transition before actually transitioning to the * next state */ rc = llc_exec_sap_trans_actions(sap, trans, skb); if (rc) goto out; /* * Transition SAP to next state if all actions execute successfully */ sap->state = trans->next_state; out: return rc; } /** * llc_sap_state_process - sends event to SAP state machine * @sap: sap to use * @skb: pointer to occurred event * * After executing actions of the event, upper layer will be indicated * if needed(on receiving an UI frame). sk can be null for the * datalink_proto case. */ static void llc_sap_state_process(struct llc_sap *sap, struct sk_buff *skb) { struct llc_sap_state_ev *ev = llc_sap_ev(skb); /* * We have to hold the skb, because llc_sap_next_state * will kfree it in the sending path and we need to * look at the skb->cb, where we encode llc_sap_state_ev. */ skb_get(skb); ev->ind_cfm_flag = 0; llc_sap_next_state(sap, skb); if (ev->ind_cfm_flag == LLC_IND) { if (skb->sk->sk_state == TCP_LISTEN) kfree_skb(skb); else { |
04e4223f4 [LLC]: Do better ... |
219 |
llc_save_primitive(skb->sk, skb, ev->prim); |
1da177e4c Linux-2.6.12-rc2 |
220 221 222 223 224 |
/* queue skb to the user. */ if (sock_queue_rcv_skb(skb->sk, skb)) kfree_skb(skb); } |
d57b1869b [NET] LLC: Fix wh... |
225 |
} |
1da177e4c Linux-2.6.12-rc2 |
226 227 228 229 230 231 232 233 234 235 236 237 238 |
kfree_skb(skb); } /** * llc_build_and_send_test_pkt - TEST interface for upper layers. * @sap: sap to use * @skb: packet to send * @dmac: destination mac address * @dsap: destination sap * * This function is called when upper layer wants to send a TEST pdu. * Returns 0 for success, 1 otherwise. */ |
d57b1869b [NET] LLC: Fix wh... |
239 |
void llc_build_and_send_test_pkt(struct llc_sap *sap, |
1da177e4c Linux-2.6.12-rc2 |
240 241 242 243 244 245 246 247 |
struct sk_buff *skb, u8 *dmac, u8 dsap) { struct llc_sap_state_ev *ev = llc_sap_ev(skb); ev->saddr.lsap = sap->laddr.lsap; ev->daddr.lsap = dsap; memcpy(ev->saddr.mac, skb->dev->dev_addr, IFHWADDRLEN); memcpy(ev->daddr.mac, dmac, IFHWADDRLEN); |
d57b1869b [NET] LLC: Fix wh... |
248 |
|
1da177e4c Linux-2.6.12-rc2 |
249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 |
ev->type = LLC_SAP_EV_TYPE_PRIM; ev->prim = LLC_TEST_PRIM; ev->prim_type = LLC_PRIM_TYPE_REQ; llc_sap_state_process(sap, skb); } /** * llc_build_and_send_xid_pkt - XID interface for upper layers * @sap: sap to use * @skb: packet to send * @dmac: destination mac address * @dsap: destination sap * * This function is called when upper layer wants to send a XID pdu. * Returns 0 for success, 1 otherwise. */ void llc_build_and_send_xid_pkt(struct llc_sap *sap, struct sk_buff *skb, u8 *dmac, u8 dsap) { struct llc_sap_state_ev *ev = llc_sap_ev(skb); ev->saddr.lsap = sap->laddr.lsap; ev->daddr.lsap = dsap; memcpy(ev->saddr.mac, skb->dev->dev_addr, IFHWADDRLEN); memcpy(ev->daddr.mac, dmac, IFHWADDRLEN); ev->type = LLC_SAP_EV_TYPE_PRIM; ev->prim = LLC_XID_PRIM; ev->prim_type = LLC_PRIM_TYPE_REQ; llc_sap_state_process(sap, skb); } /** * llc_sap_rcv - sends received pdus to the sap state machine * @sap: current sap component structure. * @skb: received frame. * * Sends received pdus to the sap state machine. */ |
3446b9d57 llc: Fix double a... |
288 289 |
static void llc_sap_rcv(struct llc_sap *sap, struct sk_buff *skb, struct sock *sk) |
1da177e4c Linux-2.6.12-rc2 |
290 291 292 293 294 |
{ struct llc_sap_state_ev *ev = llc_sap_ev(skb); ev->type = LLC_SAP_EV_TYPE_PDU; ev->reason = 0; |
3446b9d57 llc: Fix double a... |
295 |
skb->sk = sk; |
1da177e4c Linux-2.6.12-rc2 |
296 297 |
llc_sap_state_process(sap, skb); } |
b76f5a842 llc: convert the ... |
298 299 300 301 302 303 304 305 306 307 |
static inline bool llc_dgram_match(const struct llc_sap *sap, const struct llc_addr *laddr, const struct sock *sk) { struct llc_sock *llc = llc_sk(sk); return sk->sk_type == SOCK_DGRAM && llc->laddr.lsap == laddr->lsap && llc_mac_match(llc->laddr.mac, laddr->mac); } |
1da177e4c Linux-2.6.12-rc2 |
308 309 310 311 312 313 314 315 316 |
/** * llc_lookup_dgram - Finds dgram socket for the local sap/mac * @sap: SAP * @laddr: address of local LLC (MAC + SAP) * * Search socket list of the SAP and finds connection using the local * mac, and local sap. Returns pointer for socket found, %NULL otherwise. */ static struct sock *llc_lookup_dgram(struct llc_sap *sap, |
bc0e64679 [LLC]: add multic... |
317 |
const struct llc_addr *laddr) |
1da177e4c Linux-2.6.12-rc2 |
318 319 |
{ struct sock *rc; |
b76f5a842 llc: convert the ... |
320 |
struct hlist_nulls_node *node; |
52d58aef5 llc: replace the ... |
321 322 |
int slot = llc_sk_laddr_hashfn(sap, laddr); struct hlist_nulls_head *laddr_hb = &sap->sk_laddr_hash[slot]; |
b76f5a842 llc: convert the ... |
323 324 325 |
rcu_read_lock_bh(); again: |
52d58aef5 llc: replace the ... |
326 |
sk_nulls_for_each_rcu(rc, node, laddr_hb) { |
b76f5a842 llc: convert the ... |
327 328 329 330 331 332 333 334 335 |
if (llc_dgram_match(sap, laddr, rc)) { /* Extra checks required by SLAB_DESTROY_BY_RCU */ if (unlikely(!atomic_inc_not_zero(&rc->sk_refcnt))) goto again; if (unlikely(llc_sk(rc)->sap != sap || !llc_dgram_match(sap, laddr, rc))) { sock_put(rc); continue; } |
1da177e4c Linux-2.6.12-rc2 |
336 337 338 339 |
goto found; } } rc = NULL; |
52d58aef5 llc: replace the ... |
340 341 342 343 344 345 346 |
/* * if the nulls value we got at the end of this lookup is * not the expected one, we must restart lookup. * We probably met an item that was moved to another chain. */ if (unlikely(get_nulls_value(node) != slot)) goto again; |
1da177e4c Linux-2.6.12-rc2 |
347 |
found: |
b76f5a842 llc: convert the ... |
348 |
rcu_read_unlock_bh(); |
1da177e4c Linux-2.6.12-rc2 |
349 350 |
return rc; } |
b76f5a842 llc: convert the ... |
351 352 353 354 355 356 357 358 359 360 361 |
static inline bool llc_mcast_match(const struct llc_sap *sap, const struct llc_addr *laddr, const struct sk_buff *skb, const struct sock *sk) { struct llc_sock *llc = llc_sk(sk); return sk->sk_type == SOCK_DGRAM && llc->laddr.lsap == laddr->lsap && llc->dev == skb->dev; } |
0f7b67dd9 llc: optimize mul... |
362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 |
static void llc_do_mcast(struct llc_sap *sap, struct sk_buff *skb, struct sock **stack, int count) { struct sk_buff *skb1; int i; for (i = 0; i < count; i++) { skb1 = skb_clone(skb, GFP_ATOMIC); if (!skb1) { sock_put(stack[i]); continue; } llc_sap_rcv(sap, skb1, stack[i]); sock_put(stack[i]); } } |
bc0e64679 [LLC]: add multic... |
379 380 381 382 383 384 385 386 387 388 389 390 |
/** * llc_sap_mcast - Deliver multicast PDU's to all matching datagram sockets. * @sap: SAP * @laddr: address of local LLC (MAC + SAP) * * Search socket list of the SAP and finds connections with same sap. * Deliver clone to each. */ static void llc_sap_mcast(struct llc_sap *sap, const struct llc_addr *laddr, struct sk_buff *skb) { |
0f7b67dd9 llc: optimize mul... |
391 392 |
int i = 0, count = 256 / sizeof(struct sock *); struct sock *sk, *stack[count]; |
6d2e3ea28 llc: use a device... |
393 394 395 |
struct hlist_node *node; struct llc_sock *llc; struct hlist_head *dev_hb = llc_sk_dev_hash(sap, skb->dev->ifindex); |
bc0e64679 [LLC]: add multic... |
396 |
|
b76f5a842 llc: convert the ... |
397 |
spin_lock_bh(&sap->sk_lock); |
6d2e3ea28 llc: use a device... |
398 399 400 |
hlist_for_each_entry(llc, node, dev_hb, dev_hash_node) { sk = &llc->sk; |
bc0e64679 [LLC]: add multic... |
401 |
|
b76f5a842 llc: convert the ... |
402 |
if (!llc_mcast_match(sap, laddr, skb, sk)) |
7ee66fcb9 [LLC]: multicast ... |
403 |
continue; |
bc0e64679 [LLC]: add multic... |
404 |
sock_hold(sk); |
0f7b67dd9 llc: optimize mul... |
405 406 407 408 409 410 |
if (i < count) stack[i++] = sk; else { llc_do_mcast(sap, skb, stack, i); i = 0; } |
bc0e64679 [LLC]: add multic... |
411 |
} |
b76f5a842 llc: convert the ... |
412 |
spin_unlock_bh(&sap->sk_lock); |
0f7b67dd9 llc: optimize mul... |
413 414 |
llc_do_mcast(sap, skb, stack, i); |
bc0e64679 [LLC]: add multic... |
415 |
} |
1da177e4c Linux-2.6.12-rc2 |
416 417 418 |
void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb) { struct llc_addr laddr; |
1da177e4c Linux-2.6.12-rc2 |
419 420 421 |
llc_pdu_decode_da(skb, laddr.mac); llc_pdu_decode_dsap(skb, &laddr.lsap); |
bc0e64679 [LLC]: add multic... |
422 423 |
if (llc_mac_multicast(laddr.mac)) { llc_sap_mcast(sap, &laddr, skb); |
1da177e4c Linux-2.6.12-rc2 |
424 |
kfree_skb(skb); |
bc0e64679 [LLC]: add multic... |
425 426 427 |
} else { struct sock *sk = llc_lookup_dgram(sap, &laddr); if (sk) { |
3446b9d57 llc: Fix double a... |
428 |
llc_sap_rcv(sap, skb, sk); |
bc0e64679 [LLC]: add multic... |
429 430 431 432 |
sock_put(sk); } else kfree_skb(skb); } |
1da177e4c Linux-2.6.12-rc2 |
433 |
} |